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<a name="boost_regex.syntax.character_classes.std_char_classes"></a><a class="link" href="std_char_classes.html" title="Character Classes that are Always Supported">Character
        Classes that are Always Supported</a>
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<p>
          The following character class names are always supported by Boost.Regex:
        </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Name
                  </p>
                </th>
<th>
                  <p>
                    POSIX-standard name
                  </p>
                </th>
<th>
                  <p>
                    Description
                  </p>
                </th>
</tr></thead>
<tbody>
<tr>
<td>
                  <p>
                    alnum
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any alpha-numeric character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    alpha
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any alphabetic character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    blank
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any whitespace character that is not a line separator.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    cntrl
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any control character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    d
                  </p>
                </td>
<td>
                  <p>
                    No
                  </p>
                </td>
<td>
                  <p>
                    Any decimal digit
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    digit
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any decimal digit.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    graph
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any graphical character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    l
                  </p>
                </td>
<td>
                  <p>
                    No
                  </p>
                </td>
<td>
                  <p>
                    Any lower case character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    lower
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any lower case character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    print
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any printable character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    punct
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any punctuation character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    s
                  </p>
                </td>
<td>
                  <p>
                    No
                  </p>
                </td>
<td>
                  <p>
                    Any whitespace character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    space
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any whitespace character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    unicode
                  </p>
                </td>
<td>
                  <p>
                    No
                  </p>
                </td>
<td>
                  <p>
                    Any extended character whose code point is above 255 in value.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    u
                  </p>
                </td>
<td>
                  <p>
                    No
                  </p>
                </td>
<td>
                  <p>
                    Any upper case character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    upper
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any upper case character.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    w
                  </p>
                </td>
<td>
                  <p>
                    No
                  </p>
                </td>
<td>
                  <p>
                    Any word character (alphanumeric characters plus the underscore).
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    word
                  </p>
                </td>
<td>
                  <p>
                    No
                  </p>
                </td>
<td>
                  <p>
                    Any word character (alphanumeric characters plus the underscore).
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    xdigit
                  </p>
                </td>
<td>
                  <p>
                    Yes
                  </p>
                </td>
<td>
                  <p>
                    Any hexadecimal digit character.
                  </p>
                </td>
</tr>
</tbody>
</table></div>
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
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